Individual Differences in Performance Speed Are Associated With a Positivity/Negativity Bias. An ERP and Behavioral Study

There is a current dispute over the origins, incidence, and development of Positivity Bias, i.e., preferential processing of positive relative to negative information. We addressed this question using a multi-method technique of behavioral, psychometric and event-related potential (ERP) measures in a lexical decision task (LDT). Twenty-four university students (11 female) participated (age range 18–26), but four were omitted owing to data issues. Participants were classified as Positivity Biased (PB) if their LDT responses to positive words were faster than negative words, and vice versa for those classified as Negativity Biased (NB), leading to a group of 11 PB participants and a group of 9 NB participants. Interestingly, the PB group was significantly faster overall than the NB group and had significantly shorter P2 component ERP latencies in the left occipital region. Furthermore, the PB group had significantly higher scores for expressive suppression (ES), together with higher scores for Crystallized Knowledge and for cognitive reappraisal (CR). These results suggest that around 55% of the students had Positivity Bias, and these were more efficient in processing information and had better emotion regulation abilities than those with a Negativity Bias

The selection of bank management trainees: a validation study

Twelve studies of psychometric prediction using cognitive ability tests with upper level managerial samples are summarized. Of these, only two yield essentially positive results. Meyer (1956) found·a correlation of .27 between Wonderlic scores and overall ratings of 142 supervisors. However, since the raters were free to examine predictor-scores while making their ratings, there is strong evidence that the criterion was contaminated. In an unpublished study, Laurent (1962) correlated ratings of managers with Miller Analogies Test and non-verbal abiliti test scores. With over 200 persons in each sample, he found correlations ranging from .18 to .29, all significant. The majority of the studies in this area, however, do not appear encouraging. While almost all of the correlations using cognitive ability tests are positive, only infrequently are they of sufficient magnitude to be statistically significant, much less practically significant. The conclusion one is forced to accept is that, insofar as the prediction of managerial performance is concerned; the present state of the art in the testing industry is not well developed. There would appear to be several possible explanations for the lack of consistently demonstrated validity encountered in the prediction of managerial performance

Kooka(borough)

The Kookaburra as iconic Australian bird is represented in this photo-series exploring photomention principles, of photographing the decisive moment but rather than documenting it fully, applying documention theory of glancing or incorporating in passing through. This follows on in the vein of Group f/64 who through the lowest f stop sought to achieve detail and specificity that was beyond realist painting\u27s capabilities. Of which, Henri Cartier-Bresson wrote: “In photography, there is a new kind of plasticity, the product of instantaneous lines made by movements of the subject. We work in unison with movement as though it were a presentiment of the way in which life itself unfolds. But inside movement there is one moment at which the elements in motion are in balance. Photography must seize upon this moment and hold immobile the equilibrium of it.” This seizing of the frozen moment at which movement/moment are aligned towards a new geometry of spontaneity forms the basis of my aesthetic towards realist iconic immediacy - of phot(icon)ography. A borough is a subdivision of a city, for example London or New York - where a borough is administered with limited powers given to it by the city\u27s local government. In a city such as Wagga Wagga, we relegate nature to the borough of an administered domain, wherein nature itself has been provided limited controls over its own agency. This photograph series, in this case Kooka(borough) clearly, decisively aims to restore nature to its primacy. The work continues its enquiry into the decisive moment aesthetic, and of naturalism and observed opportunity. It is not a photoshopped or otherwise altered or mediated photograph in any manner. A kookaburra alighted on the main flag-pole in the Historic Gardens in Wagga Wagga, and the Australian flag fluttered. The occurrence of our national symbols being naturally juxtaposed in this manner would be rare indeed; perhaps three million to one - this is a straight photograph of just such an instant where the real is beyond the range of normalcy. The photograph was shot on a hand-held Canon A480, rather than Cartier-Bresson\u27s preferred 35mm camera. My photographic practice continues to explore these principles of straight photography, and autojournalism, to investigate observed iconic moments

A problem-oriented theory of pattern-oriented analysis and design

The overall goal of this work is to provide problem-oriented support for Pattern-Oriented Analysis and Design (POAD) so that (i) we may construct a better understanding of the relationship of POAD to other software development approaches and (ii) we can extend the reach of problem-orientation to design patterns. This paper extends our previous contributions to show how both high-level and detailed design phases can be given a problem-oriented encoding

On the action potential as a propagating density pulse and the role of anesthetics

The Hodgkin-Huxley model of nerve pulse propagation relies on ion currents through specific resistors called ion channels. We discuss a number of classical thermodynamic findings on nerves that are not contained in this classical theory. Particularly striking is the finding of reversible heat changes, thickness and phase changes of the membrane during the action potential. Data on various nerves rather suggest that a reversible density pulse accompanies the action potential of nerves. Here, we attempted to explain these phenomena by propagating solitons that depend on the presence of cooperative phase transitions in the nerve membrane. These transitions are, however, strongly influenced by the presence of anesthetics. Therefore, the thermodynamic theory of nerve pulses suggests a explanation for the famous Meyer-Overton rule that states that the critical anesthetic dose is linearly related to the solubility of the drug in the membranes.Comment: 13 pages, 8 figure

Drug therapies for attentional disorders alter the signal-to-noise ratio in the superior colliculus

Despite high levels of use, the mechanism of action of effective pharmacotherapies in attention deficit hyperactivity disorder (ADHD) is unknown. It has recently been hypothesized that one site of therapeutic action is the midbrain superior colliculus, a structure traditionally associated with visual processing, but also strongly implicated in distractibility, a core symptom of ADHD. We used male juvenile Wistar rats to examine the effects of therapeutically relevant doses of methylphenidate and d-amphetamine on collicular activity in vitro. Here we report a novel shared mechanism of the two drugs whereby they enhance the signal-to-noise ratio in the superior colliculus. The effects on the signal-to-noise ratio were mediated by serotonin (5-HT) via a pre-synaptic mechanism. This modulatory action would bias the system towards salient events and lead to an overall decrease in distractibility

Retrograde discs around one component of a binary are unstable to tilting

With hydrodynamic simulations we show that a coplanar disc around one component of a binary can be unstable to global tilting when the disc orbits in a retrograde direction relative to the binary. The disc experiences the largest inclination growth relative to the binary orbit in the outermost radii of the disc, closest to the companion. This tilt instability also occurs for test particles. A retrograde disc is much larger than a prograde disc since it is not tidally truncated and instead spreads outwards to the orbit of the companion. The coplanar retrograde disc remains circular while a coplanar prograde disc can become eccentric. We suggest that the inclination instability is due to a disc resonance caused by the interaction of the tilt with the tidal field of the binary. This model is applicable to Be/X-ray binaries in which the Be star disc may be retrograde relative to the binary orbit if there was a sufficiently strong kick from the supernova that formed the neutron star companion. The accretion on to the neutron star and the resulting X-ray outbursts are weaker in the retrograde case compared to the prograde case.Comment: 6 pages, 3 figures, accepted for publication in MNRA

TarO : a target optimisation system for structural biology

This work was funded by the UK Biotechnology and Biological Sciences Research Council (BBSRC) Structural Proteomics of Rational Targets (SPoRT) initiative, (Grant BBS/B/14434). Funding to pay the Open Access publication charges for this article was provided by BBSRC.TarO (http://www.compbio.dundee.ac.uk/taro) offers a single point of reference for key bioinformatics analyses relevant to selecting proteins or domains for study by structural biology techniques. The protein sequence is analysed by 17 algorithms and compared to 8 databases. TarO gathers putative homologues, including orthologues, and then obtains predictions of properties for these sequences including crystallisation propensity, protein disorder and post-translational modifications. Analyses are run on a high-performance computing cluster, the results integrated, stored in a database and accessed through a web-based user interface. Output is in tabulated format and in the form of an annotated multiple sequence alignment (MSA) that may be edited interactively in the program Jalview. TarO also simplifies the gathering of additional annotations via the Distributed Annotation System, both from the MSA in Jalview and through links to Dasty2. Routes to other information gateways are included, for example to relevant pages from UniProt, COG and the Conserved Domains Database. Open access to TarO is available from a guest account with private accounts for academic use available on request. Future development of TarO will include further analysis steps and integration with the Protein Information Management System (PIMS), a sister project in the BBSRC Structural Proteomics of Rational Targets initiative.Publisher PDFPeer reviewe

Attention-deficit hyperactivity disorder-like traits and distractibility in the visual periphery

We examined the performance of non-clinical subjects with high and low levels of self-reported ADHD-like traits in a novel distractibility paradigm with far peripheral visual distractors, the likely origin of many distractors in everyday life. Subjects were tested on a Sustained Attention to Response Task with distractors appearing before some of the target/non-target stimuli. When the distractors appeared 80 ms before the targets/non-targets, participants with high levels of ADHD-like traits were less affected in their reaction times than those with lower levels. Reducing the distractor-target/non-target interval to 10 ms removed the reaction time advantage for the high group. We suggest that at 80 ms the distractors were cueing the arrival of the target/non-target and that those with high levels of ADHD-like traits were more sensitive to the cues. Increased sensitivity to stimuli in the visual periphery is consistent with hyper-responsiveness at the level of the superior colliculus